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haskell / alex

A lexical analyser generator for Haskell
https://hackage.haskell.org/package/alex
BSD 3-Clause "New" or "Revised" License
298 stars 82 forks source link

Forward-compatibility for Semigroup/Monoid proposal #82

Closed hvr closed 8 years ago

hvr commented 8 years ago

This makes the code compatible with some future GHC which will make Semigroup a superclass of Monoid... there's of course no guarantee there won't be other changes needed ;)

With these changes, alex compiles warning free under -Wcompat